Myositis ossificans is defined as benign, localized reactive, non-neoplastic, fibrous, osseous and cartilaginous proliferative lesion within the soft tissue, at times in the periosteum and usually associated with trauma. Injury either direct or indirect remains an important factor in its pathogenesis. Traumatic myositis ossificans is called as myositis ossificans circumscription while when not associated with trauma it is called pseudomalignant myositis ossificans. It can also be caused by extensive burn, immobilization due to coma or paraplegia, severe neurological disorder such as head injury or spinal cord injury. Clinically it could be differentiated into acute or pseudotumoral phase and mature stage. Plain x-ray helps in differentiating the acute and mature stage. CT/MRI show characteristic features in various stages. Biopsy is indicated to rule out osteogenic sarcoma. Among the various characteristic features of myositis ossificans on CT, MRI and USG, there occur considerable overlap with the appearance of malignant tumor and osteomyelitis. Hence a combination of imaging techniques is most useful in differentiating infections and neoplasm from heterotrophic ossification. Conservative treatment is the method of choice in acute stage while surgery to release soft tissue and excise myositis mass is considered in chronic stage.